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by Fixnum
4792 days ago
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The soon-to-be-released GHC 7.8 (Haskell) can defer type errors until runtime to allow you run your program even if part of it is broken, and you can also add "holes" in place of an arbitrary expression and the compiler will tell you the type of the expression you need to replace it with (of course, this will explode if run). I suspect GHC's error messages are better than Ocaml's as well. |
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On the Scheme side of things, I've heard that the newish (4.8.0 and up) versions of Chicken can perform flow analysis to catch some type errors at compile time, and optimize based on types.
There's also Typed Racket, and Chicken has a contracts egg that allows procedures to have pre- and post- conditions.
For some years now, I've heard predictions that in the future languages will allow their users to "dial up" or "dial down" safety features on demand. I guess the above features of Scheme and Haskell are some early steps along that path. We live in interesting times.